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Support for application programs in a distributed environment

a distributed environment and application program technology, applied in the field of data processing systems, can solve the problems of large complexity, affecting the complete application, and masking of problems, and achieve the effect of facilitating the identification of duplicate messages

Inactive Publication Date: 2000-10-24
IBM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this patent is that it describes how to handle multiple simultaneous messages by assigning unique identifiers to each one and keeping track of them through a database. This helps prevent conflicts and delays caused by overlapping responses, while still allowing users to resend their messages if they don't receive initial confirmation.

Problems solved by technology

The technical problem addressed in this patent text needs to be identified by a senior R&D person who has read it through.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example a

in FIG. 7A, Instance1 sends a single inform message to Instance2. The arrival of this message satisfies Rule1 and Procedure1 is invoked.

When the application support infrastructure invokes Procedure1, it passes the procedure an identifier for the BLInform message to show that the message has arrived.

2. Rule for a single request message: A rule of this type will be satisfied when a single named request message arrives.

example b

in FIG. 7B, Instance1 sends a single request message to Instance2. The arrival of this message satisfies Rule2.

A message identifier for BLRequest is passed to Procedure1 when the procedure is invoked, to show that the message has arrived.

3. Rule for a single late reply message: when the procedure that processes a request message has to send its own request to get information from another class, it is possible for the reply to arrive later than when it is required. This is considered to be a `late reply message` if it arrives too late to be used by the reply to the original request. In example C below, the message named Reply2 is late because it arrives after the message named Reply is sent.

If an application is to process any late reply message, then a rule of this type 3 must be used. If an instance does not have a rule to process a late reply message, then that message is discarded. A rule of this type 3 is satisfied when the single named late reply message arrives. Only one late m...

example c

in FIG. 7C, a procedure (Procedure1) sends two requests and sets a timer. Rule6 is satisfied when the timer expires (invoking Procedure2), even though only one reply has arrived. A rule of type 3 is needed to process the late reply. When Procedure3 is invoked, a message data flag for the Reply2 message is passed to the procedure to show that the message has arrived.

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PUM

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Abstract

Provided are a system and method for supporting communication between application programs and the processing of messages by those programs. A table driven approach is used to select appropriate components of modular application programs to process received messages. The selection is carried out in dependence on associations between message types (e.g. request, inform, reply) and other characteristics of the message (e.g. whether the message is an expected reply (as identified by an identifier value). Also used in said selection are dynamic characteristics of the message or the system (e.g. possibly expiry of a timeout, or the state of an application). Rules combine these criteria and determine the conditions for invoking an application program component. Also provided is a mechanism for differentiating between reply messages which are received out of serial sequence but are still current and messages which are invalid.

Description

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Claims

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Application Information

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Owner IBM CORP
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